ASINH(3M-SysV)      RISC/os Reference Manual       ASINH(3M-SysV)



NAME
     asinh, acosh, atanh - inverse hyperbolic functions

SYNOPSIS
     #include <math.h>

     double asinh(x)
     double x;

     double acosh(x)
     double x;

     double atanh(x)
     double x;

DESCRIPTION
     These functions compute the designated inverse hyperbolic
     functions for real arguments.

ERROR (due to Roundoff etc.)
     These functions inherit much of their error from log1p
     described in exp(3M).

DIAGNOSTICS
     acosh returns the default quiet NaN if the argument is less
     than 1.

     atanh returns the default quiet NaN if the argument has
     absolute value bigger than or equal to 1.

SEE ALSO
     exp(3M), math(3M).

AUTHOR
     W. Kahan, Kwok-Choi Ng




















                         Printed 1/15/91                   Page 1